Air-cooled tapping attachment



Oct. 14, 1952 M. H. EMRICK ATR-cooLED TAPPING ATTACHMENT Filed Jan. l5, 1949 A INVEN-ron MELVIN H. EMR|CK ATTORNE.

Patented Oct.l 14, 1952 UNITED STATES TENT OFFICE a. 2,613,786 i 1 y' AIa-cooLED TAPPI-NGJATTACI-IMENT l Melvin n. Emrick-,-r1amaia N. Y.

.'Application' January 15, 'iVBfiQlg'SeriallNol '71,179

n This invention relates to'tapping attachments, f More: particularly, the invention dealswith an attachment of lthe character described having f means providing a circulation of air through thel lattachment to cool the working parts.' Still more '-7particularly, the invention includes a multiple f= blade' fan'element larranged in 'the attachment to I';stimulate air vcirculation therethrough.

IThe novelfeatures of the invention will be best understood from-the following descriptions', when 1 taken together with the accompanying drawing,

Fig. 2 is a section substantially on the line 2 2 of Fig. 1, showing only part of the' attachment.

friese isa plan view of a blank, lfrom which `v"fan element or device vvis formed ;v` and ping attachment, generally of rthe structure dis' closedin my prior applicationSer.' No. 30,720 filed June 2, r1948,-the attachment beingmodified i `,toj'the extent hereinafter more specically defined in producing what I term anV air cooled 'tapping attachment.' The attachmentr as shown Fig. 4 is a side edge? view of the device in folded or operative position.v

In Fig. 1 of the drawing, I have-shown a tap-` Vinthe accompanying drawingv comprises a casing having an upper part I0, a-lower part II, the

' HVparts having at adjacent surfaces, abutting flanges I2 and I3 secured together by'screws I4.

' l vThe upper part IIJ has a laterally extending boss I'apertured, as indicated at I6, for reception of .'a rod I1, the rod being secured in position by set screws I8. This'structureserves to retain the at- 'tachmentagainst movement in a machine when theattachment is in operation.

Ialso preferably' employ a key pin I9 between the vcasingparts adjacent the boss I5, as a'matter of further reinforcement in the coupling of the parts.

The upper casing I' has a tubular bearing portion 20, having at its inner end an l inwardly extending ange 2I. v'Seated in the bearing'portion 20 is a double-racev ball bearing,

as seenA at 22,'held in position by asleeve 23.

Mounted in the bearing 22 lis a lower end 24 of a [tapered spindler having a reduced vthreaded ex- "tension 25 with which is coupled the upper drive "'gear 26. The 'gear 25'is of V-cupeshaped formation. The gear has' circumferentially spaced key j"pin's 21 for keying a conical drive shell 28 toithe `gear; thev `shell"b'ein`g"held in place'by a' spring' s claims. (oruga-fus) 'Y -fringi'2e seating in an Mgear-Secured tothe inner surface ofthe drive 1 -she'llf28 is a friction'facing 3|, the facing being y secured tothe' shell in any desiredmanner.

The lower casing party vII has af'tubular bear- 'ingportion' 32 in which'is mounted a' an'ged sleeve 33. 'On the sleeve 33 ismounted ai ball bearing 34, held in position on the sleeve and in conjunction with-the'bearing 32,' by anut 35.

lVloillvnted'k on Yther bearing 34 isa reverseI drive gearf 36.` The gear`V 3l"hasA circumferentially 'spaced-key lpins 31 Vfor keying va reverse-drive conical shell'33 to thegeanthe shell being'held is'mounted a driving Ahead 44 having oppositely taperedand relatively thin wall'portions'45 and 15" against displacementvfromf'the gear by a "split spring ring 39 operating in a groove 40 inthe gear. 0in the inner surface of the shell 38" is arranged a friction facing 4I secured to the lshell in any suitable manner. f

Arranged within the lsleeve33 is va shaft or spindle 42, onl the upper reducedv end 43 of which 46",'- adapted to operatively engage the forward and reverse drive cones, as in other devices of this kind: This head is generallyv referred to'as a doublefacedconical clutch head. AThe tapered end portions 45 and 43 join the hub portion 41 of the khead 44 in a plurality of spiders or' webs 48,

as clearly seen in Fig. 2 of the drawing.

A' The tapered portions 45 and 46 are strengthk ened'bycircumferentially spaced ribs or fins 4S A"and v5l), which stimulate cooling and alsov operate 11o-stimulate air circulation through the attachment,1as will be apparent. Between the head 44 andfthegsleeve 33 ls'arrangedaJ coil vspringy 5I which'normally serves tosupport the head in the forward or directdrive position, as' will be apparent. A nut 52 is mounted on the threaded vportion of the reduced' extension 43',v to hold the `head 44 in position, the nut having suitable -key- This nut also serves to ing means, as at 53. support my improved fan element or device 54 fin lposition on the head, at the'right of the vcas" ing, asseen in Fig. 1, thelusual drive between the drive gear 26 and the reverse drive gear 35.

' ly referred to as follows:

` A* gear 55 meshes with .the gear 26 and with another gear, not shown, on a shaft 55, thev latter having a gear 51 which meshes withfthe gear 36.

' Each casing part I8 and II h-asone or more {vent openings, one opening being shown at 58 on the part I0 and one opening 59 on the part II,

eaChbpenin'g'is preferably screened, Las seenv at 6U and 6|. The drive shell 2B has adjacent the base thereof, or near the upper end of the cone, as seen in Fig. 1, circumferentially spaced vent openings 62 and the cone 3B has similar vent openings 63. These openings are disposed adjacent the vents 58 and 59 so that in the rotation f the conical shells, air can be freely circulated from the vents into the interior of the shells and the head 44.

The fan element or device 54 is shown in blank, in Fig. 3 of the drawing, and comprises a circular type center body portion 64, apertured centrally, as seen at 65, for reception of the end 43 of the spindle 42.- The disc body 64 has tangentially disposed and extending blade elements 66, four of which are shown in the accompanying drawing.

In forming the fan device from the blank, as seen.

in Fig. 3, the blades 66 are first folded upwardly along the lines 61 and then downwardly onjthe line 68, producing a result substantially similar to that illustrated in Fig. 4, in other words, blade ends 69 which extend below the disc 64, and preferably flared to a slight extent and upper ldouble wall end portions 10. The ends 69 have a reasonable amount of flexibility and these ends bear upon the webs 48 and extend below said webs, as is clearly illustrated in Figs. 1 and 2 of the drawmg.

Considering Fig. 2 of the drawing, it will appear that the blade ends 69 bear against the webs 48 and are thus backed by the webs in one directional drive of the attachment and this arrangement of the blades form large `openings through the head and in the disc portion 64, as clearly seen in said figure. These openings provide for the free circulation of air through the attachment. The disc portion 64 in itself forms a fan-like element and while this disc portion is shown substantially horizontal in the accompanying drawing, it is quite apparent that the tip portions, as at 1|,

' could be offset to produce of the disc portion, a substantially fan-like body which would assist in the control of circulation of air through the attachment, In operation, the air is drawn into the lower part of the attachment through one or `more openings 59 and is circulated inwardly and outwardly around the head and cones, and then discharged through one or more openings 58 in the upper casing part. In other Words, by'utilizing a simple fan element or device, shaped from a sheet of metal, in the manner disclosed and by making slight changes in thev structure of the attachment, a positive and stimulating circulation of air is provided through the attachment which will operate to maintain lower temperatures between the operating parts which is desirable, parreduced, while at the same time, the .required strength in the head is maintained. Here it is to be understood thatthe structure of and spacing of the fins may be made. to control .the desired results required. i

The attachment operates in the manner of other devices of this kind. In other words, in the forward drive of the driven shaft 42, the cone 28 operates upon the head 44, then in the upward feed of a tap through aworkpie'ce the headv 44 4 is drawn into engagement with the cone 38 against the action of the spring 5l in the reverse drive of the shaft 42.

Having fully described my invention, what I claim as new and desire to secure by Letters Patent is:

1. In tapping attachments of the class described employing a casing, a drive-spindle and a driven shaft in the casing, forward and reverse drive conical shells, means placing said shells in operative engagement with the drive spindle, a doublefaced conical clutch head intermittently movable into engagement with said shells in the forward and reverse drive of the'driven shaft, said head having a central hub portion joining the periphery ofthe head in a web structure, a fan element detachably mounted on thehub and engaging the web structure, said conical drive shells having circumferentially spaced apertures, and said casingadjacent the apertures of said shell having vent passages, whereby in the operation of the attachment, a forced circulation of air is provided through the attachment by said fan elementt lv2. In tapping attachments of the class described employing a casing, a drive spindle and a driven shaft in the casing, forward and reverse drive lconical shells, means placing said shells in operative engagement with the drive spindle, a doublefaced conical clutch head yintermittently movable into engagement with said shells in the forward and reverse drive ofthe driven shaft, said head having a central hub portion joining the periphery of the head in a web structure, afan element detachably mounted on the hub and engaging the web structure, said conicaly drive shells having circumferentially spaced apertures, said casing adjacent the apertures of said shell having vent passages, Awhereby in the operation of -the attachment, a forced circulation ofairis `provided through the attachment by said fan element, and said fan element comprising a series of blades arranged in the head longitudinally .with respect to the axis of said head.

3. In tapping attachments of the -class described employing `a casing, a drive spindlev and a driven shaft in the casing, forward and reverse drive conical shells, means placing said shells in operative engagement withithe'driv'e spindle, a` 4double-faced conical clutch head intermittently movable into engagement with said shells in the forward and reverse drive of the driven shaft,

rsaid head having a central hub portion joining the periphery of the head in a web structure, a fan element detachably mounted on the hub andengaging the web structure, said conical drive shells Vhaving circumferentially spaced apertures, said a driven shaft in the casing, forward and reverse drive conical shells, means placing said shells in operative engagement with the drive spindle, a double-faced conical clutch head intermittently movable into engagement with said shellsin the forward and reverse drive of they driven shaft, said head having a central hub portion joining the periphery of f the head inra web structure, a

fan element detachably mounted on the hub and engaging the web structure, said conical drive shells having circumferentially spaced apertures, said casing adjacent the apertures of said shell having vent passages, whereby in the operation of the attachment, a forced circulation ofA air is provided through the attachment by said fan ele-4 ment, said fan element comprising a series of blades arranged in the head longitudinally with respect to the axis of said head, a disc portion defined by circumferentially spaced parts integrally joining the blades, and each conical portion of the head having on the inner surface thereof, circumferentially spaced fins.

5. In tapping attachments of the class described employing a casing, a drive spindle and a driven shaft in the casing, forward and reverse drive conical shells, means placing said shells in operative engagement with the drive spindle, a doubled-faced conical clutch head intermittently movable into engagement with said shells in the forward and reverse drive of the driven shaft, said head having a central hub portion joining the periphery of the head in a web structure, a fan element detachably mounted on the hub and engaging the web structure, said conical drive shells having circumferentially spaced apertures, said casing adjacent the apertures of said shell having vent passages, whereby in the operation of therattachment, a forced circulation of air is provided through the attachment by said fan element, and inner surfaces of the conical portions of said head having circumferentially spaced ns.

6. In tapping attachments of the class described employing a casing, a drive spindle and double-faced conical clutch head intermittently movable into engagement with said shells in the forward and reverse drive of the driven shaft, said head having a central hub portion joining the periphery of the head in a web structure, means detachably mounted on said head forming a series of circumferentially spaced air circulating blades, means on the casing and said cones providing circulation of air into the casing around a driven shaft in the casing, forward and reverse drive conical shells, means placing said shells in operative engagement with the drive spindle, a double-faced conical clutch head intermittently movable into engagement with said shells in the forward and reverse drive of the driven shaft, said head having a central hub portion joining the periphery ofthe head in a web structure, means detachably mounted on said head forming a series of circumferentially spaced air circulating blades, and means on the casing and said cones providing circulation of air into the casing around the cones and through said head.

7. In tapping attachments of the class described employing a casing, a drive spindle and a driven shaft in the casing, forward and reverse drive conical shells, means placing said shells in operative engagement with the drive spindle, a

the cones and through said head, and the tapered conical portions of said hea-d having circumferentially spaced ribs.

8. In tapping attachments of the class described employing a casing, a drive spindle yand a driven shaft in the casing, forward and reverse drive conical shells, means placing said shells in operative engagement with the drive spindle, a double-faced conical clutch head intermittently movable into engagement with said shells in the forward and reverse drive of the driven shaft, said head having a central hub portion joining the periphery of the head in a web structure, the casing, cones and said head having means providing forced circulation of air through the `attachment, said last named means comprising circumferentially spaced radially extending fan blades detachably fixed to said central hub portion, and circumferentially spaced fins on said head and arranged longitudinally with respect to the axis of said head.

MELVIN H. EMRICK.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name `Date 719,033 Norris Jan. 27, 1903 1,023,272 Oakes Apr. 16, 1912 1,064,412 White June 10, 1913 1,509,937 Down Sept. 30, 1924 1,671,443 Norris May 29, 1928 1,872,483 Meyer Aug. 16, 1932 1,988,967 Emrick Jan. 22, 1935 2,222,764 Gaston Nov. 26, 1940 2,231,465 Emrick Feb. 11, 1941 2,243,334 Eksergean May 27, 1941 2,299,796 Chase Oct. 27, 1942 2,357,923 Anderson Sept. 12, 1944 2,380,387 Allen July 31, 1945 2,454,471 Momberg Nov. 23, 1948 2,500,071 Hans Mar. 7, 1950 

